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fuse located under the dash or in the glove box depending on where they put it, it could also be under the hood in the relay box on the passenger side. the relay is in this same relay box. on the under side of the cover there should be a chart that indicates which relay is what.
I believe it is the fourth relay from the left passenger side in the engine compartment against the firewall. I am assuming your horn intermittently goes off by itself. It's a interior heat related issue. The horn pad cover on the steering wheel has a membrane layer. It's basically a switch that has one wire that goes to the horn relay to activate the horn. The Buick GM logo embossed on this plastic cover is where I found it most sensitive to any light touch. Unhook the battery. If you carefully cut the right edge of the the steering wheel horn pad and carefully pry it out a little, it will fix this issue and still be able to use the horn. It's another GM defect. I hope this helps! Let me know.
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Subject: How to check an inoperative horn
Customer's exact description:...the horn on my 1995 Buick LeSabre does not work...how to fix? Here's how it's done: Step 1. Start with the pre-check: Do a Thorough Visual Inspection Do a thorough visual and "hands-on" underhood inspection before starting any diagnostic procedure! You can find the cause of many problems by just looking, thereby saving yourself a lot of time.• Has the vehicle been servicedrecently? Sometimes things getreconnected in the wrong place, ornot at all.• Don't take shortcuts. Inspect connectorsand wiring which may be difficult tosee due to location. Step 2. Instructions: One. Remove the horn relay and check for battery voltage at the relay connector terminals.
If battery voltage is present at both terminals, go to Two.
If battery voltage is not present, check the ORN wiring and the relay fuse for circuit.
Two. With the horn switch depressed, measure voltage from the relay terminals. Wear hearing protectors, if someone is assisting you and depressing the horn switch while you're under the hood.
If voltage is present, go to Three.
If battery voltage is not present, check the black wire for an open circuit; check the connectors for proper terminal contact; check the in-line connector for proper terminal contact; check the spring loaded contact, slip ring, and horn switch for an open circuit.
Three: Connect a fused jumper from relay connector terminal 30 to terminal 86.
If the horn does not sound, go to Four.
If the horns sound, replace the horn relay.
Four: Disconnect the the suspect horn connector. Connect a fused jumper from the suspect horn terminal B (dark green) to the positive + battery terminal.
If the horn sounds, check the wiring to the horn relay for an open circuit or short to the ground.
If horn doesn't sound, check the black wiring for an open circuit, if OK, then replace the horn.
Start by having someone press the horn while you feel the relay with your finger. If the relay clicks when the horn is pressed then the switch is working properly and your problem is between the relay and horn assembly.
Before checking the horn, I would check all of the fuses and the horn relay. If all of those are fine, on a lot of vehicles the horn is located inside either the left or right front clip. In other words, in the space between the left and right engine bay walls, and the outside of the left and right fender. You will have to remove the inside of the fender (above the wheels) to see if the horn is in there. Also, the switch inside the steering wheel could have gone out. If you can get the front panel off of the steering wheel, run a wire from the positive to negative wires on the horn switch, if the horn works, the switch has gone out.